Moon Illuminated fraction:
Moonset at &nbsp on 00-00-0000set at &nbsp on 00-00-0000set at &nbsp on 00-00-0000set at &nbsp on 00-00-0000set at &nbsp on 00-00-0000set at &nbsp on 00-00-0000set at &nbsp on 00-00-0000

Zenith Hourly Rate. The number of meteors that a single observer
will see in a
dark night
if the radiant is in the
zenith
and stars as faint as
magnitude
6.5 are visible with the naked
eye.

Radiant

The position on the
celestial sphere from which the meteors
of a given shower emanate.

Solar longitude (λ)

The
ecliptic longitude of the
Sun (in the J2000.0 coordinates system),
at the time in which the Earth encounters the densest part
of the meteorid stream.

How to read the plots
The three plots at the bottom of the page show the Sun altitude (yellow
line), Moon altitude (purple line), and Radiant altitude
(colored line) as a function
of time during the night.
The color coding on the radiant altitude represent the distance
(in degrees; 1° equal about 1day) from the time in which
the Earth is crossing the densest part of the meteor stream
(which its solar longitude is given in the upper right corner of the plot).
Best circumstances occur when the altitude of the radiant is maximal
at the time in which Earth crosses the densest region of the stream,
and the Moon phase (shown in the upper left) is minimal.